IEEE standardized. Name: IEEE 1076.
Non-free standard... http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4772740&filter=AND(p_Publication_Number:4772738)
Major revisions:
- 1987: first
- 1993: major
- 2000 and 2002: minor
- 2008: major
A way people refer to the standard, and is written on the cover.
https://en.wikipedia.org/wiki/EDA_database
https://en.wikipedia.org/wiki/Silicon_Integration_Initiative